Authors:N. Thavaprakash, G. Senthilkumar, S. D. Sivakumar and M. Raju
A field experiment was conducted at the Main Research Station, University of Agricultural Sciences, Dharwad, India, on medium black soils during the kharif (wet) season of 1999. The experiment was laid out in a randomized complete block design with varying N/P ratios (0.67 to 2.00) along with a control with a constant level of potassium (60 kg ha-1). The results revealed that the number of green leaves plant-1, the dry matter accumulation in the leaves, leaf area (dm2 plant-1) and leaf area index (LAI) increased up to the flowering stage (65 DAS) and thereafter declined. In the early stages (seedling and button stages) there was no significant variation with respect to the number of green leaves plant-1 among the treatments except in the control. Similarly, leaf area and LAI did not vary at the seedling stage. Treatments receiving N/P ratios of ?1.0 or 1.0 with higher doses of nitrogen (120 kg N ha-1) gave a significantly higher number of green leaves plant-1, leaf area and LAI as compared to N/P ratios of <1.0 and the control in later stages. The dry matter accumulation in the leaves (g plant-1) differed in all the stages, but higher values were recorded in these same treatments. Thus, due to the higher number of green leaves, higher LAI and greater dry matter accumulation in the leaves, the treatments with an N/P ratio of ?1.0 or 1.0 with 120 kg N ha-1 produced higher seed yields (3188 to 3554 kg ha-1) than other N/P ratios (2761 to 3009 kg ha-1). The highest yield (3554 kg ha-1) was recorded with an N/P ratio of 1.0 in the treatment receiving 120 kg N and 120 kg P2O5 ha-1. The correlation coefficients between these photosynthetic attributes and seed yield were also positive and significant.
A field experiment was conducted at the Eastern Block, Department of Central Farm, Tamil Nadu Agricultural University, Coimbatore, India, on medium black soils during the North Eastern Monsoon Season (October-January) of 2002. The experiment was laid out in a randomized block design (RBD) with varying combinations of organic and inorganic sources along with a control and the recommended dose of fertilizers. The results revealed that the number of tillers per plant was enhanced by the application of a combination of organic and inorganic sources. The leaf area index (LAI) increased up to 60 days after sowing and thereafter declined. Leaf area duration (LAD) and crop growth rate (CGR) were reduced at maturity. Treatments receiving 50% N from yeast sludge composted coir pith (YCCP) with ZnSO
and 50% inorganic N gave a significantly higher number of tillers, LAI and CGR compared to the control. The dry matter accumulation differed in all the stages, but higher values were recorded in this same treatment. Thus, due to the higher number of tillers, higher LAI, CGR and greater dry matter accumulation, treatment with 50% N from YCCP with ZnSO
and 50% inorganic N (T
) produced the highest grain yield (2185 kg ha
), which was on par with 50% N from pleurotus composted coir pith (PCCP) with ZnSO
and 50% inorganic N (2103 kg ha
Authors:Farzaneh Garousi, Béla Kovács, Éva Domokos-Szabolcsy and Szilvia Veres
Supplement of common fertilizers with selenium (Se) for crop production will be an effective way to produce selenium-rich food and feed. The value of green pea seeds and forages as alternative protein source can be improved by using agronomic biofortification. Therefore, biological changes of green pea (Pisum sativum L.) and influences of inorganic forms of Se (sodium selenite and sodium selenate) at different concentrations on the accumulation of magnesium (Mg) and phosphorus (P) were investigated in greenhouse experiment. 3 mg kg−1 of selenite had positive effects to enhance photosynthetic attributes and decrease lipid peroxidation significantly. At the same time, Se accumulation increased in all parts of plant by increasing Se supply. Moreover, Mg and P accumulations were significantly increased at 3 mg kg−1 selenite and 1 mg kg−1 selenate treatments, respectively. By contrast higher selenite concentrations (≥30 mg kg−1) exerted toxic effects on plants. Relative chlorophyll content, actual photochemical efficiency of PSII (ФPSII) and Mg accumulation showed significant decrease while membrane lipid peroxidation increased. Thus, the present findings prove Se biofortification has positive effects on biological traits of green pea to provide it as a proper functional product.
Authors:D. Sharma, D. Rana, R. Kaushik, S. Kumar and H. Joshi
Ramesh, S., Santhi, P., Ponnuswamy, K. (2006): Photosyntheticattributes and grain yield of pearl millet [
(L.) R. Br.] as influenced by the application of composted coir pith under rainfed conditions.
Acta Agron. Hung.
Authors:Samia Ageeb Akladious and Heba Ibrahim Mohamed
Thavaprakash , N. , Senthil kumar , G. , Siva kumar , S. D. , Raju , M. ( 2003 ) Photosyntheticattributes and seed yield of sunflower as influenced by different levels and ratios of nitrogen and phosphorous fertilizers . Acta Agrono. Hungarica 51
involved in photosynthesis were improved, which enhanced photosynthesis. In conformity with these findings, it was also reported that, under drought stress conditions, exogenous PAs application on rice improved the photosyntheticattributes as well as water